diff --git a/db.c b/db.c
index 30da7d3..8408730 100644
--- a/db.c
+++ b/db.c
@@ -29,29 +29,31 @@
 #include "extern.h"
 
 enum    stmt {
-    STMT_BOOK,
-    STMT_BOOKS,
-    STMT__MAX
+  STMT_BOOK,
+  STMT_BOOKS,
+  STMT__MAX
 };
 
 static const char *const stmts[STMT__MAX] = {
   /* STMT_BOOK */
-  "SELECT books.id AS id,title FROM books WHERE books.id = ?",
+  "SELECT books.id AS id,title,series_index,name as series_name,series.id AS series_id FROM books LEFT OUTER JOIN books_series_link ON books.id = books_series_link.book LEFT OUTER JOIN series ON series.id = books_series_link.series WHERE books.id = ?",
   /* STMT_BOOKS */
   "SELECT books.id AS id,title FROM books LIMIT ?",
 };
 
 void
-db_book_free(struct book *b)
+db_book_free(Book *b)
 {
   if (NULL == b)
     return;
   free(b->title);
+  //TODO free series
+  free(b->s.name);
   free(b);
 }
 
 int
-db_books_load(struct kreq *r, struct book **books, int limit)
+db_books_load(struct kreq *r, Book **books, int limit)
 {
   if (limit < 0) {
     return 0;
@@ -63,7 +65,7 @@ db_books_load(struct kreq *r, struct book **books, int limit)
             STMT_BOOKS);
   ksql_bind_int(stmt, 0, limit);
   while (KSQL_ROW == ksql_stmt_step(stmt)) {
-    books[i] = kcalloc(1, sizeof(struct book));
+    books[i] = kcalloc(1, sizeof(Book));
     books[i]->id = ksql_stmt_int(stmt, 0);
     books[i]->title = kstrdup(ksql_stmt_str(stmt, 1));
     i++;
@@ -72,11 +74,11 @@ db_books_load(struct kreq *r, struct book **books, int limit)
   return i;
 }
 
-struct book *
+Book *
 db_book_load(struct kreq *r, int64_t id)
 {
   struct ksqlstmt *stmt;
-  struct book   *book;
+  Book  *book;
   ksql_stmt_alloc(r->arg, &stmt, 
             stmts[STMT_BOOK], 
             STMT_BOOK);
@@ -85,9 +87,12 @@ db_book_load(struct kreq *r, int64_t id)
     ksql_stmt_free(stmt);
     return(NULL);
   }
-  book = kcalloc(1, sizeof(struct book));
+  book = kcalloc(1, sizeof(Book));
   book->id = ksql_stmt_int(stmt, 0);
   book->title = kstrdup(ksql_stmt_str(stmt, 1));
+  book->s_idx = ksql_stmt_int(stmt, 2);
+  book->s.name = kstrdup(ksql_stmt_str(stmt, 3));
+  book->s.id = ksql_stmt_int(stmt, 4);
   ksql_stmt_free(stmt);
   return book;
 }
diff --git a/extern.h b/extern.h
index 53ca5f1..5469c41 100644
--- a/extern.h
+++ b/extern.h
@@ -18,18 +18,50 @@
 #define EXTERN_H
 
 /*
- * A book.
+ * A book series.
  */
-struct book {
-  int64_t   id; /* unique identifier */
+typedef struct
+{
+  int64_t   id;
+  char     *name;
+} Series;
+
+/*
+ * A book. Generic data.
+ */
+typedef struct
+{
+  int64_t   id;
   char     *title;
+  int       s_idx; /* series index */
+  Series    s;
+} Book;
+
+/*
+ * An author.
+ */
+typedef struct
+{
+  int64_t   id;
+  char     *name;
+} Author;
+
+/*
+ * A book. Advanced data: authors, tags.
+ */
+struct book_adv
+{
+  Book b;
+  size_t autsize;
+  Author *authors;
+  // TODO tags
 };
 
 __BEGIN_DECLS
 
-struct book * db_book_load(struct kreq *r, int64_t id);
-int db_books_load(struct kreq *r, struct book **books, int limit);
-void db_book_free(struct book *b);
+Book *db_book_load(struct kreq *r, int64_t id);
+int db_books_load(struct kreq *r, Book **books, int limit);
+void db_book_free(Book *b); // TODO series
 
 void		 db_close(struct kreq *);
 int		 db_open(struct kreq *, const char *);
diff --git a/main.c b/main.c
index b691313..8c60648 100644
--- a/main.c
+++ b/main.c
@@ -95,7 +95,7 @@ puterror(struct kjsonreq *req, char *message)
 }
 
 void
-putbook(struct kjsonreq *req, struct book *b)
+putbook(struct kjsonreq *req, Book *b)
 {
   kjson_obj_open(req);
   kjson_putintp(req, "id", b->id);
@@ -109,7 +109,7 @@ sendbooks(struct kreq *r)
   struct kjsonreq    req;
   const char *errid;
   int64_t id = -1;
-  struct book *b = NULL;
+  Book *b = NULL;
   int res, i = 0;
 
   if (NULL != r->fieldmap[KEY_ID])
@@ -128,7 +128,7 @@ sendbooks(struct kreq *r)
     db_book_free(b);
   } else {
     kjson_array_open(&req);
-    struct book **books = kcalloc(10, sizeof(struct book));
+    Book **books = kcalloc(10, sizeof(Book));
     res = db_books_load(r, books, 10);
     while (i < res) {
       putbook(&req, books[i]);