Christie London Massive Volume 4

Christie London Massive Volume 4 is the fourth collected edition of the sequel series to Christie High Tension.

Publisher's Summary
クリスティ不在のホープ家に、異国の言葉を話す双児の美少女が迷いこんだ. デクスターが銃撃され、さらにはモリアーティ教授も巻き込み、事件はある陰謀へと繋がっていき……!

Rough translation:

Chapter List
Case 4: Case X:
 * The Adventure of Two Princesses (I)
 * The Adventure of Two Princesses (II)
 * The Adventure of Two Princesses (III)
 * The Adventure of Two Princesses (IV)
 * The Adventure of Two Princesses (V)
 * The Adventure of Two Princesses (VI)
 * The London Irregulars