Ten Trixie Belden mystery books in large paperback format. Included are:

#3 The Gatehouse Mystery

#13 The Mystery on Cobbett's Island

#16 The Mystery of the Missing Heiress

#19 The Secret of the Unseen Treasure

#21 Mystery of the Castaway Children

#23 The Mystery of the Queen's Necklace

#29 The Mystery of the Velvet Gown

#32 The Mystery of the Whispering Witch

#33 The Mystery of the Vanishing Victim

#34 The Mystery of the Missing Millionaire

The books have some cover wear, but they are all in good or very good condition. The pages have some age-related yellowing, but the pages of all the books are tight, clean and in very good condition.